Qualcomm Incorporated

Jinbo Li

Ara Bicakci

Sean Joel Lyn

An apparatus is disclosed for sharing a filter circuit between transmission and reception modes. In example aspects, the apparatus includes a wireless interface device. The wireless interface device includes a transmit chain, a receive chain, and a filter circuit. The transmit chain includes a first component and a second component. The receive chain includes a third component and a fourth component. The filter circuit includes an amplifier, and the amplifier includes a first stage and a second stage. The first stage includes a transmit portion coupled to the second stage and a receive portion coupled to the second stage. The transmit portion and the second stage are coupled together in series between the first component and the second component of the transmit chain. The receive portion and the second stage are coupled together in series between the third component and the fourth component of the receive chain.

Shared filter for transmission and reception

A transceiver circuit includes transmit circuitry comprising a transmit baseband filter and a driver amplifier having an output coupled to a power amplifier, receive circuitry comprising a low noise amplifier and a receive baseband filter, mixer circuitry and a magnetic circuit, wherein the mixer circuitry and the magnetic circuit are coupled between the transmit baseband filter and the driver amplifier, and are further coupled between the low noise amplifier and the receive baseband filter, wherein the mixer circuitry and the magnetic circuit are shared between the transmit circuitry and the receive circuitry in a time division duplexing (TDD) communication system.

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San Jose, CA, United States of America

Jinbo Li